<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.jsdelivr.net/npm/vue@2"></script>
    <title>Document</title>
</head>
<body>
    <div id="app">
        <input type="text" v-model="val" @input="handleChange">
    </div>
    <script>
        new Vue({
            el:'#app',
            data() {
                return {
                    val:'',
                    time:null
                }
            },
            mounted(){
                console.log(1)
            },
            methods: {
                handleChange() {

                    clearTimeout(this.time)
                    this.time = setTimeout(()=>{
                        console.log(this.val)
                    },1000)
                }
            },
        })
    </script>
</body>

</html>